Oh my...
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4b4bd8c50f4836ba7d3fcfd6c90f96d2605779fe, introduced because 'this gets rid of the bulk of the annoying warnings during an allmodconfig build for me', causes `/usr/local/src/kernel/linux-git/drivers/acpi/tables.c:399:1: error: ‘nonstring’ attribute ignored on objects of type ‘const char[][4]’ [-Werror=attributes]` for me.
No spoons to re-subscribe to lkml and report this though.